Make sure not to use a web browser which specializes in disabling parts of a website.
If you are using a standard browser, disable any add-ins.
If you haven’t already, switch the “DNS server” (either in your router’s settings or in the properties of the Windows network connection) to the known working 1.1.1.1 or 8.8.8.8
The above method for claiming will only work on Windows 10/11. If you use a Windows Server edition, use Plex install fix for Windows Server (Claim issue) instead.
